Feature Request

[iambenkay]

Hello. Nice work on this package it almost totally served my use case.
I seem to have noticed an important feature that I really need but is not included currently. I could write it myself and make a PR. Basically a flexible way of formatting text with different rich text parameters. Here is a sample and expected output:

   color.PrintRTf("The title is *%s*", "bold")
   color.PrintRTf("The title is _%s_", "italic")
   color.PrintRTf("The text color is $(fg:red|%s)", "red")
   color.PrintRTf("The background color is $(bg:green|%s)", "green")

Output:
The title is bold
The title is italic
The text color is red ('red' should be colored red)
The background color is green ('green' should have a green background)

So essentially, they can all be mixed in one format string and used.